Test-retest reliability of Picture My Participation in children with intellectual disability in South Africa

Figures & data

Figure 1. Visual four-point Likert scale for the ratings of attendance. “How often do you participate in…?”

Figure 2. Visual four-point Likert scale for the ratings of involvement. “How involved are you…?

Figure 3. Four examples (one from each subcomponent) of pictures/symbols from Bildstod™ (www.bildstod.se).

Table 1. Test-retest agreement at item level (linear weighted Kappa).

	Attendance						Involvement
	Kappa	Asymp SE	Z	p Value	Lower 95% Asymp CI Bound	Upper 95% Asymp CI Bound	Kappa	Asymp SE	Z	p Value	Lower 95% Asym CI Bound	Upper 95% Asym CI Bound
Personal care	0.196	0.164	1.405	0.160	−0.125	0.517	0.105	0.168	0.701	0.483	−0.223	0.433
Family mealtime	0.330	0.187	1.862	0.063	−0.037	0.697	0.178	0.172	1.172	0.241	−0.158	0.515
My own health	0.476	0.160	3.292	0.001	0.163	0.790	0.169	0.149	1.102	0.270	−0.124	0.462
Gathering supplies	0.394	0.136	3.023	0.003	0.127	0.661	0.153	0.118	1.175	0.240	−0.080	0.385
Meal preparation	0.534	0.113	4.454	0.001	0.312	0.755	0.550	0.133	4.134	0.001	0.289	0.810
Cleaning at home	0.191	0.128	1.485	0.138	−0.059	0.442	0.493	0.109	3.563	0.001	0.280	0.707
Caring for family	0.433	0.241	2.899	0.004	−0.039	0.905	0.306	0.203	1.922	0.055	−0.093	0.705
Caring for animals/pets	0.652	0.105	4.615	0.001	0.445	0.858	0.487	0.129	3.206	0.001	0.234	0.741
Family time	0.095	0.163	0.667	0.505	−0.225	0.415	0.162	0.135	1.095	0.274	−0.103	0.427
Celebrations	0.281	0.136	2.213	0.027	0.014	0.548	0.231	0.135	1.709	0.087	−0.032	0.495
Playing with others	0.169	0.186	1.246	0.213	−0.195	0.532	0.510	0.131	3.570	0.001	0.252	0.768
Orginised leisure	0.293	0.108	2.286	0.022	0.082	0.504	0.340	0.174	2.325	0.020	−0.001	0.681
Quiet leisure	0.335	0.120	2.258	0.010	0.099	0.571	0.286	0.154	1.990	0.047	−0.015	0.587
Spiritual activities	0.285	0.170	2.191	0.028	−0.049	0.619	0.375	0.145	2.671	0.008	0.091	0.658
Shopping	0.367	0.127	2.965	0.003	0.119	0.616	0.409	0.162	2.721	0.007	0.092	0.726
Social activities	0.025	0.104	0.233	0.823	−0.179	0.229	0.223	0.138	1.786	0.074	−0.049	0.494
Health centre	0.268	0.131	2.045	0.041	0.012	0.525	0.396	0.161	2.556	0.011	0.081	0.712
School	0.303	0.248	2.641	0.008	−0.183	0.790	0.229	0.191	1.618	0.106	−0.145	0.603
Overnights visits and trips	0.143	0.126	1.310	0.190	−0.104	0.390	0.315	0.155	2.230	0.026	0.012	0.619
Paid/unpaid employment	0.300	0.122	2.348	0.019	0.062	0.538	0.291	0.152	2.181	0.029	−0.008	0.589

Table 2. Intraclass Correlation Coefficient (ICC)^b (absolute agreement) for the total scale and per component.

	Attendance							Involvement
Picture My Participation	ICC^a	Lower Bound	Upper Bound	Value	df1	df2	Sig	ICC^a	Lower Bound	Upper Bound	Value	df1	df2	Sig
Total scale	0.64	0.38	0.81	4.52	30	30	0.001	0.63	0.27	0.82	5.68	30	30	0.001
Comp 1. Organised activities	0.57	0.28	0.77	3.67	30	30	0.001	0.60	0.31	0.78	3.95	30	30	0.001
Comp 2. Social interactions	0.54	0.23	0.75	3.32	30	30	0.001	0.53	0.22	0.74	3.27	30	30	0.001
Comp 3. Family activities	0.26	−0.10	0.56	1.68	30	30	0.080	0.33	−0.02	0.61	1.99	30	30	0.032
Comp 4. Personal activities	0.60	0.31	0.78	3.95	30	30	0.001	0.40	0.06	0.66	2.32	30	30	0.012

Single measures. Two-way random effects model where both people effects and measures effects are random.

^aThe estimator is the same, whether the interaction effect is present or not.

^bType C intra class correlation coefficients using a consistency definition-the between-measure variance is excluded from the denominator variance.